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GosheniteVSPhenakite
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
- ◎ is higher in Phenakite, giving a numerical distinguishing point.
- ◎ is higher in Phenakite, giving a numerical distinguishing point.
- ◎ is higher in Phenakite, giving a numerical distinguishing point.
Note: properties whose numeric ranges do not overlap are auto-extracted. Both are measurable with a refractometer or heavy-liquid bath.
| Property | A: Goshenite | B: Phenakite | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.566–1.590 | 1.654–1.670 | B higher |
| Specific gravity (SG) | 2.66–2.80 | 2.95–3.00 | B higher |
| Mohs hardness | 7.5–8.0 | 7.5–8.0 | Nearly equal |
| Birefringence | 0.006 | 0.016 | B higher |
| Dispersion | — | — | — |
| Property | A: Goshenite | B: Phenakite |
|---|---|---|
| Crystal system | 六方晶系 | 三方晶系 |
| Pleochroism | — | — |
| Chelsea filter | inert | — |
| UV (long-wave) | inert | — |
| UV (short-wave) | inert | inert |
◆Goshenite (colorless beryl) has RI 1.57–1.58, SG 2.72, and Mohs 7.5; phenakite has RI 1.65–1.67, SG 2.96, with a brighter polish and the higher characteristic of beryllium silicate over beryllium aluminum silicate.
Distinguishing tools
Tools that decide between Goshenite and Phenakite in practice.
Note: this page is auto-generated from published GIA / CGL reference values. Individual stones, treatments, and synthetics may fall outside these ranges. For a definitive identification, consult an accredited gem laboratory.